Magneto apparatus.



R. FISCHER, MAGNETO APPARATUS. I APPLIOATION FILED JAN. 29. 1913.

1,131,921, Patented Mar.16,1915.

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mnfrnn srafrns PATENT onirica.

RICHARD FISCHER, OF FRANKFORT-GN-THE-MAIN-RDELHEIM, GERM-ANY, ASSIGNOR T0 THE FIRM F MAFAM lllOTOR-APPABATE G. M. B. H., 0F FRANKFORT-ON-TBE- MAN, GERME.

MAGNET@ AFPARAT'US.

Speclcation of Eetters Patent.

meneer,

To all wwm'z't may concern:

Be it lmownthat l, RICHARD FISCHER, a citizen of the German Empire, and a resident of Frankfort-on-the-li/lain, Rdelheim, Germany, have invented certain new and useful Improvements in lf/lagneto rfipparatus.

This invention relates to improvements in magneto ignition apparatus and has for' its object to provide an ignition device, which, besides having increased reliability as coi pared with magneto devices as heretofore constructed will insure a thorough ignition of the explosive mixture. Numerous attempts have been made to attain this result, which attempts have, besides apparatus with automatic ignition devices, included the double type of apparatus, which type of apparatus has been found suitable on account of its manifold adaptability. Among suoli constructions are some consisting of two single apparatus, arranged side by side, or one above the other. Such an arrangement partly possesses the advantage of an increased reliability and partly, by being mounted on an ordinary base plate, that of economy of space.

The present invention aims to provide a magneto apparatus on an ordinary base plate and with a driving shaft, which will, apart from its compact mounting, be an advance upon that heretofore proposed, particularly by reason of its high eiiiciency of ignition. The latter result is attained by a parallel arrangement of two similar armatures in a common magnetic pole system, and by obtaining uniform distribution of the lines of magnetic force by the special shaping of the polepieces. i

The invention will now be described more -fully with reference to an example thereof to be of rectangular cross section (with recesses for the space taken up by the arma-v Patented Mar. 16, 1915-.

seria1No. 744,983.

ture) yprobably the lines of force would be distributed unevenly between the two armatures so that it would depend on the theoretical position of the magnetic poles to which of the two armatures the greater number of lines of force'would low.

According to the prcsentvinvention after having determined the position of the magnetic poles l to t* with the existing construction of the pole casing, the pole pieces p1, p2 of Fig. 2 are shaped, as for instance by cutting away portions al, a? at one end to form isolated pole tips, so that their area of contact with the magnets, byallowing the requisite amount and position of air gap, insures a .practically equal length of path for the lines of force which are balanced by the two armatures.

The considerably increased eiiciency of the improved device as compared with that of other constructions can be readily eX- plained by the fact that owing to the Conn ection in parallel of the two paths of the lines of force the resistance of the unavoidable four air gaps when two armatures are present is reduced in a manner which can be understood from the analogy of two electric resistances connected in parallel. Also the displacement of the field, which is caused by the opposite direction of rotation of the two armatures at each break, favorably influences the force of the induction shock.

The rotation of the two armatures in opposite directions, and at the same speed is effected, as indicated in Fig. 1, simply by directly gearing them together by means of toothed wheels el, z2. Moreover the stability of the magnet itself, especially when the two armatures are set at 90o apart is increased by the fact that in no position of the armatures will the flow of the lines of force be materially interrupted.

It will be obvious that the apparatus can be employed as a two-spark magneto apparatus without a distributer for four-cylinder motors, and for motors, the cylinders of which are arranged at an angle, by a corresponding setting of the armatures as indicated in Figs. 1 vand 2 respectively.

Now what`I claim as new and desire to secure by Letters Patent is 1. A magneto apparatus including a plui rality of eld'magnets, a pair of oppositely arranged pole pieces, and a plurality of armatures operatively and permanently con` 2. A magneto apparatus including a plu- A ralityof field magnets, a pair of oppositely arranged pole pieces out away at one end to form isolated pole tips, and a plurality of armatures operatively and permanently oonneeted for rotation together 1n opposite directions and at the same speed between 1`0 the said pole pieces.

In testimony whereof I llave affixed my signature in presence of two witnesses.

RICHARD FISCHER. Witnesses: Y

JEAN GRUND, CARL GRUND.

copies ot this patent may be obtained for ve cents eah, by addressing the Commissioner of Patente,

Wathington, D. 0. 

